Thaum peb xa cov teeb liab, txawm tias nws yog lub teeb liab kho qhov muag lossis lub teeb liab hluav taws xob lossis lub teeb liab wireless, yog tias nws raug xa mus ncaj qha, lub teeb liab raug cuam tshuam rau lub suab nrov, thiab nws nyuaj rau kom tau txais cov ntaub ntawv raug ntawm qhov kawg tau txais. Txhawm rau txhim kho qhov muaj peev xwm tiv thaiv kev cuam tshuam ntawm lub kaw lus, nws tuaj yeem ua tiav los ntawm kev hloov kho lub teeb liab. Modulation tseem tuaj yeem txhim kho qhov kev siv cov channel, yog li kev hloov kho muaj txiaj ntsig zoo rau kev ua tau zoo thiab kev ntseeg siab ntawm kev sib txuas lus.
Lub kaum sab xis modulation tau piav qhia hauv qab no yog rau cov teeb liab analog.
Sinusoidal cab kuj muaj peb yam tsis muaj: amplitude, zaus thiab theem. Peb tuaj yeem thauj cov ntaub ntawv ntawm cov teeb liab modulated tsis tsuas yog nyob rau hauv lub amplitude hloov ntawm cov cab kuj, tab sis kuj nyob rau hauv lub zaus los yog theem hloov ntawm tus cab kuj. Thaum lub sijhawm hloov kho, yog tias qhov zaus ntawm cov cab kuj hloov pauv nrog lub teeb liab modulated, nws yog hu ua zaus hloov kho lossis zaus hloov pauv (FM); Yog tias cov theem ntawm cov cab kuj hloov nrog lub teeb liab modulated, nws yog hu ua theem modulation los yog theem modulation (PM). Hauv ob txoj kev hloov pauv no, qhov amplitude ntawm tus cab kuj tseem nyob tas li, thaum qhov kev hloov pauv hauv zaus thiab theem yog tshwm sim raws li qhov kev hloov pauv hauv lub sijhawm tam sim ntawm tus cab kuj, yog li qhov kev hloov pauv zaus thiab theem kev hloov pauv tau sau ua ke hu ua Angle modulation.
Qhov sib txawv ntawm lub kaum sab xis thiab qhov kev hloov pauv hloov pauv yog qhov hloov pauv ntawm lub teeb liab spectrum tsis yog ib qho kev hloov pauv ntawm tus thawj modulated teeb liab spectrum lawm, tab sis ib qho kev hloov pauv tsis hloov ntawm lub spectrum, uas yuav tsim cov zaus tshiab sib txawv ntawm qhov hloov spectrum, yog li nws yog. kuj hu ua nonlinear modulation.
FM thiab PM yog dav siv hauv kev sib txuas lus. FM yog dav siv nyob rau hauv high-fidelity suab paj nruag tshaj tawm, TV suab teeb liab kis tau tus mob, satellite kev sib txuas lus thiab xov tooj ntawm tes system. Ntxiv nrog rau kev siv ncaj qha rau kev sib kis, PM kuj tseem siv tau los ua kev hloov mus rau qhov tsis ncaj qha los tsim FM signals. Muaj kev sib raug zoo ntawm kev hloov pauv zaus thiab theem kev hloov pauv.
Piv nrog amplitude modulation, qhov zoo tshaj plaws ntawm lub kaum sab xis modulation yog nws cov kev ua haujlwm siab los tiv thaiv suab nrov. Txawm li cas los xij, muaj kev lag luam tawm ntawm kev nce thiab kev poob, thiab tus nqi ntawm qhov zoo dua yog tias Angle modulation occupies wider bandwidth tshaj amplitude modulated signals.
Cov saum toj no yog Shenzhen HDV Phoelectron Technology Co., Ltd. rau koj coj los ntawm "nonlinear modulation (Lub kaum sab xis modulation)" kev paub. Shenzhen HDV Phoelectron Technology Co., Ltd. yog feem ntau yog raws li kev sib txuas lus cov khoom rau kev tsim cov tuam txhab, cov khoom siv tam sim no npog:ONUseries, kho qhov muag module series,OLTseries, transceiver series. Muaj peev xwm muab kev pabcuam customized rau cov xwm txheej sib txawv ntawm cov kev xav tau hauv network, txais tos tuaj sab laj.
